red line

US:USA pronunciation: respellingUSA pronunciation: respelling(v. redlīn′; n. redlīn)

Inflections of 'red line' (v): (⇒ conjugate)
redlines
v 3rd person singular
redlining
v pres p
redlined
v past
redlined
v past p

WordReference Random House Unabridged Dictionary of American English © 2025
red line′, [Ice Hockey.]
  1. Sporta line of the color red that is parallel to and equidistant from the goal lines and divides the rink in half.
  • 1960–65

red•line  (v. redlīn′;n. redlīn),USA pronunciation v., -lined, -lin•ing, n. 
v.t. 
  1. to treat by redlining (an area or neighborhood).
  2. to establish the recommended safe speed of (an airplane):The bomber is redlined at 650 miles an hour.
  3. to draw a canceling red line through (an item on a list).
  4. to mark or designate for cancellation, rejection, dismissal, or the like:club members redlined for unpaid dues.
  5. Aeronauticsto cause (an airplane) to be grounded.

v.i. 
  1. to engage in redlining.

n. 
  1. Automotive
    • the maximum rotational speed, or angular velocity, of the engine crankshaft that is considered safe: often measured in rpm.
    • a red line or boundary of a red area that delineates such a value, as on a tachometer.
Also, red-line′. 
  • red1 + line1 1940–45
redlin′er, n. 


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